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(No Model.)

E. S. T, KENNEDY. RADIAL TUBE STEAM BGILER.

Patented May 29, 1894.

1 I. Il Il @MMM/w? UNITE Tatras EDWARD S. T. KENNEDY, OF NEW YORK, N. Y.

RADIAL-TUBE STEAllvl-BOILER.`

SPECIFICATION forming' part 0f Letters Patent No. 520,684, dated. May29, 1894.

Application filed August 27, 1889. Serial No. 322.108. (Nomotlel.)

To @ZZ whom it may concern.-

-Be it known that I, EDWARD S. T. KENNEDY, a citizen of the UnitedStates, residing at New York city, in the county of New York and Stateof New York, have invented certain new and useful Improvements inRadial-Tube Steam-Boilers; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to radial tube or porcupine steam boilers of thattype composed of a central water cylinder or stand pipe provided withradial water and steam tubes, and surrounded by a deflecting furnace andshell having deflecting plates at different heights above the fire-box,and more' particularly this invention comprises certain lmprovements inthe construction of the central water cylinder or stand pipe of theboiler, covered by Patent No. 375,324-, granted to me under date ofDecember 20, 1887.

As heretofore constructed, and in accordance with the description in theabove patent, the central cylinder or stand pipe was constructed ofshort cylindrical sections, each of which had a vertical riveted seam,and the sections were joined at their ends by circular riveted seams.The short cylindrical sections composing the stand pipe were rivetedtogether in such manner that the vertical riveted seams of adjacentsections extended in different'vertical lines at suitable distancesapart, that is,-one fourth of the circumference of the cylinders, onefrom the other in successive order fromlef t to right, whereby theradial tubes could be arranged and spaced in the successive sections soas to divert and distribute the heated currents uniformly around thestand pipe in contact with all the radial tubes. By means of the aboveconstruction I was able to break up the vertical seam extending from topto bottom of the stand pipe, and thus avoid the formation of a directflue, since in each section the tubes could be set in close regularorder directly above the vertical seam of the section below and theiiame and hot products were thus more evenly distributed about the standpipe and in contactwith the radial tubes, but still the short verticalflue spaces were left along the vertical seams for the reason that suchseams interfered with the regular setting of radial tubes, materiallydecreasing the number of tubes which could be set in the stand pipe, andalso necessarily leaving the short vertical iiues, through which theflames and hot products would pass in larger volume than through otherportions of the combustion chamber, resultingin uneven heating and inuneven circulation of the water in the boiler.

` The object of my present invention-is to remedy the above difficultiesand avoid all vertical seams and flues, whereby the radial tubes may beset in close regular order around the entire circumference of the standpipe and from bottom to top thereof, and whereby a greater number oftubes may be set in a stand pipe of a given diameter. In order toaccomplish this object I lap-weld together the vertical edges of thesections composing the stand pipe, thus doing away with the verticalriveted seams, avoiding the thickening of metal where the seams areusually placed, and providing for the regular setting of the radialtubes by doing away with the vertical seams and the resulting iiuesnecessarily formed where such seams were placed. The sections of standpipe may be made longer andlessened in number; in fact, inthe smallersized boilers, a single section might be used' composed of a sheetwelded at its edges from bottom to top. In order to secure a moreextended heating surface in this type of boiler, I provide the lower orfire box section of the stand pipe, which passes through the re bricksor deflecting furnace with corrugatlons as shown.

My invention is illustrated in the accompanying drawing, whichillustrates an elevation of the boiler partly in section.

The furnace and shell A, of the boiler are built of brick and lined to asufficient height with fire-brick suitably set upon a foundation W. Theshell -is provided with numerous sight openings and doors u, and issurmounted by suitable hood and smoke stack. The usual fire chamber,ash-pit and grate are arranged at the lower part of the shell around thestand pipe, and deflectors c, c are arranged in the usual manner.

The stand pipe B, is composed of cylindrical sections 1,v 2, 3, and 4,or other convenient number, as shown. It is provided with a flanged anddished lower head I, riveted or welded to the cylindrical portion, andthe walls of the cylinder extend down `and rest upon the circularfoundation plate z', which is supported by the supplementary brickfoundation n. As shown in the drawing the lower section Z, of the standpipe is provided with circular corrugations above the grate forpresenting a more extended heating surface, since such portion cannot beprovided with radial tubes for the reason that such tubes wouldinterfere with the proper firing of the boiler. The corrugations in thispart of the boiler. take the place of the tubes so far as possible, andserve an advantageous and useful purpose in this type of boiler. Thevertical seams of all the sections are welded, the best of iron or steeland of extra thickness being used, so that, when the tube holes arebored out, the required factor of safety is provided for. The tube holesare bored out at uniform distances apart and in regular order around theentire circumference of each section of the stand pipe, so that, whenthe radial tubes are properly secured in such holes, they extenduniformly from the stand pipe and avoid the formation of all fines ofeXtra Width. The iiame and hot products are therefore distributeduniformly in contact with all the tubes about the standpipe, resultingin even heating of the tubes and regular circulation of water in theboiler, so that each tube will perform its full duty.

The number of sections may be increased or vdiminished at pleasure.

My improved round end Welded tubes are used in the stand pipe. The usualmud-drum L, with man-hole plate K, is formed at the lower end of thestand pipe. The steam drying tubes peculiar to my boiler are arranged atthe top of the stand pipe and connected with the steam discharge pipe.The usual feed pipe and blow-off pipe connect with the stand pipe belowthe grate. The water-column pipe oc connects with the stand pipe belowthe grate and with the upper end thereof in the usual manner, and hasconnected at the junction of its horizontal and vertical portions athree-way valve, from which leads a discharge pipe into the ash-pit.

Having thus described my invention, what l claim, and desire to secureby Letters Patent is- Iii a radial tube boiler the stand pipe formed ofone or more sections having vertical lap welded seams, the portion abovethe fire boX or deflector, c, having radial tubes set in close regularorder around its entire circumference, and the fire box section orportion having circumferential corrugations, substantially as described.

yIn testimony whereof I-afiix my signature in presence of two witnesses.

EDWARD S. T. KENNEDY. Witnesses:

JOHN P. KENNEDY, LUTHER S. CoNKLIN.

